backstage/.changeset/large-bottles-cheer.md

@backstage/catalog-model, @backstage/plugin-catalog-backend

@backstage/catalog-model	@backstage/plugin-catalog-backend
minor	minor

BREAKING: Removed the deprecated metadata.generation field entirely. It is no longer present in TS types, nor in the REST API output. Entities that have not yet been re-stitched may still have the field present for some time, but it will get phased out gradually by your catalog instance.